UINavigation，UiView，ModalView Controller之間的關係

若是當前是個VC，那麼就太簡單了，直接就能夠push到下一個vc

AddShopViewController *controller = [[AddShopViewController alloc] init];

controller.view.backgroundColor = [UIColor whiteColor];// 設置背景色爲白色，消除殘影

[self.navigationController pushViewController:controller animated:YES];

有時候須要從modal view裏pushviewcontroller，這固然是不行的，由於你沒有NC，能夠NSLog一下試試就知道了。

NSLog(@"ViewControllers before pushing: %@", self.navigationController.viewControllers);

這時你要加某個viewController的view在你的self.view上，你必須作的是：[self addChildViewController:xxx]；或者addSubview。由於沒有nav，若是想用nav來控制vc，通常是先有nav，而後把vc加入nav中，若是自己就是個vc那麼直接

UINavigationController *navController = [[UINavigationController alloc]initWithRootViewController:self];

[self presentViewController:navController animated:YES completion:nil];

這樣你的modal就有一個nv，那麼你就能夠在這個modal裏邊用[self.navigationController pushViewController:controller animated:YES];

完整的一個寫法是這樣的，Storyboard表述的很清楚

MyViewController *myViewController = [MyViewController alloc] init];

UINavigationController *navController = [UINavigationController alloc] initWithRootViewController:myViewController];

// Presuming a view controller is asking for the modal transition in the first place.

[self presentViewController:navController animated:YES completion:nil];